What can be proven about the security of a product cipher?

1453

---

How are block ciphers used to encrypt data longer than the block size?

1345

---

Can symmetric block ciphers be used for message authentication?

1413

---

What exactly is DES?

1449

---

What is differential cryptanalysis?

1452

---

How was NSA involved in the design of DES?

1340

---

Is DES available in software?

1320

---

Is DES available in hardware?

1584

---

Can DES be used to protect classified information?

1381

---

What are ECB, CBC, CFB, OFB, and PCBC encryption?

3186

---

What is the difference between the CAs?

1930

---

What is a chained certificate?

1794

---

How do CAs sign certificates?

1900

---

What is an encryption "key" and what is the importance of key length?

1503

---

What is an algorithm?

1884

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