Search the forum,

block

In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks. They are specified elementary components in the design of many cryptographic protocols and are widely used to the encryption of large amounts of data, including data exchange protocols. It uses blocks as an unvarying transformation.
Even a secure block cipher is suitable for the encryption of only a single block of data at a time, using a fixed key. A multitude of modes of operation have been designed to allow their repeated use in a secure way to achieve the security goals of confidentiality and authenticity. However, block ciphers may also feature as building blocks in other cryptographic protocols, such as universal hash functions and pseudorandom number generators.

View More On Wikipedia.org
Recent contents Top users
  1. D

    Ideal Standard Mono block tap flexi?

    Hello , Bought a ex display tap and sink the other day and I was wondering what Flexi pipe I need here. I want a compression fitting the other end but what goes at this end. The end with the o-ring is threaded and it copper pipe looks like it pressed into the casting of the tap. If anyone...
  2. M

    Gas pipe in insulation layer above precast beam and block floor

    When installing a gas pipe in the insulation layer below the chipboard flooring. And above the precast beam and block floor. Do most tend to run the gas pipe underneath the insulation resting on the damp course (in coated copper). Or notch out on the top of the insulation and run the pipe in...
  3. G

    Setting up a shower block fuelled by rocket boiler/wood fire

    I am setting up a campsite and want to build a shower block that has a boiler heated by wood (or sawdust). I need a plumber who has experience in this. There will be three showers that will run for around 4 hours a day and the campsite is based near Chichester. If this sounds like something...
  4. M

    Mono block flexi tails

    Do people tend to just screw thi s in hand tight. I no a lot of instructions say this. I do tend to like giving a tiny nip up after if they is space to get a spanner in.
  5. Gazzt

    London tower block fire

    What a tradgity, those poor poeple caught up in that fire. It was terrifying how quickly the fire went through that building. My tboughts and prayers go out to the people of london who have gone through terrible suffering.
  6. eagleeye

    Glow worm ultracom

    One of my guys installed a Glow worm ultracom 2 in a flat just over 2 years ago. Everything has been fine until last Friday when I get a call saying water was pouring out the bottom of boiler. Had one of my other guys go look at it and he said water had stopped but when he topped it up water...
  7. M

    Hot water and heating system for toilet and shower block.

    Hi there, I have a small campsite and I am about to update the toilet and shower block, there's currently three, 6.5Kw electric showers, no hot water and no heating with all the showers being coin operated. I am wanting to put hot water into the taps and also put in some radiators. Ideally...
    • Mckenzie900
    • Thread
    • block electric heating heating system hot hot water oil shower showers system toilet water
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  8. H

    Protecting pipes chased into block walls

    Hello forum. First time user here (and now registered)! Can someone please advise the best/recommended method to protect 15mm copper pipes that I will be setting back into a wall to feed radiators in my house. I've already chased the walls, which are standard concrete blocks, but I'm aware of...
  9. U

    Protecting pipes chased into block walls

    Hello forum. First time user here! Can someone please advise the best/recommended method to protect 15mm copper pipes that I will be setting back into a wall to feed radiators in my house. I've already chased the walls, which are standard concrete blocks, but I'm aware of the long term issues...
  10. R

    Mono block tap wobbling

    Im visiting friends and have been asked to look at their wobbling kitchen tap. It's thought that the tap has come from B&Q and is about five years old. The fitting of the tap is different from all other taps I've fitted as rather than the normal tap-bolt-washer-nut arrangement this one has...
  11. C

    kitchen mono block mixer tap

    I've just replaced a mono block kitchen mixer tap for a customer that said his old Tap intermittently released a bust of water through spout, I advised him to buy a new replacement tap as I believed the cartridge maybe on the way out. I then installed a identical looking tap that he'd had...
  12. L

    Removal of buderus 500 combi heat exchanger connection plate

    Hi everyone, i have a boiler with a leak from cold water inlet and DHW outlet connections into the plastic heat exchanger connection plate. it is almost impossible to see if the leaks are from the brass nipples or a crack in the plastic block so I am going to replace both just to be on the safe...
  13. B

    How to seal off a tricky chimney draft?

    I have a decorative fireplace in my rented flat, (no actual heating just a metal cover) and behind it a large (pretty cavernous) stone space that leads up to the chimney. I want to block it up, as a lot of cold air is coming down (and heat escaping up) but am finding it difficult. I bought a...
  14. M

    mico bore heating pipes clipes to breeze block before dot and dab plasterboard

    is duct tape ok for corrosion protection on micro bore central heating pipes clipped to breeze block walls before dot and dab plasterboard
  15. D

    Variable water pressure on 3rd floor block of flats (built 2003)

    Hi...can you give me some advice please?. I have lived here for about a year and for the last month only have had severe problems with water pressure ,even the toilet cistern (ALL my water is fed from the mains and not from a tank). In a split second my pressure can go from strong to weak...and...
  16. R

    Office block coffee station dilemma

    First fixed a coffee station at an office recently. All to drawings all happy days. Just a Cold feed under a raised floor and a pumped waste feed which went under the floor below the units, due to integrated dishwasher and a fridge and then up the wall to a 1000mm high and then through wall and...
  17. J

    Worcester hydraulic block leak

    Hi guys, just wondering if any one's come across this before. Had the delight of fitting a new return side of the hydraulic block today on a Worcester 532/I, BG badged up, came to put the copper pipe back on to the top of the pump with the daft nylon locking nut and it will not seal up for any...
  18. F

    New kid on the block

    Hi all, At 38 I'm not exactly a kid but on Friday I passed my A.C.S exams ( over the moon ). I hope to be an active member of this forum and give as much help as I get. Look forward to hearing from you all soon Many thanks :yesnod:
  19. A

    Heatline monza 28

    Hi all, Looking for some advise on the above boiler ,I have been called out to one today diverter block split and main heat ex leaking also actuator and pressure sensor knackered due to water leakage priced up parts, diverter block with prv side included, actuator, pressure sensor, heat ex o...
  20. A

    CDI Compact. Wiring loom, loose wire with block what's it for?

    Hi guys went and piped up a compact CDI today, first day doing one of these and was impressed with it. Was having a nosy around it because i'll be back there Monday to finish off the install. There was a block with 2 blue wires coming out of it that was hanging loose and i couldn't see another...
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock