Quantum computing has the potential to revolutionize many fields, including cryptography. However, it is unlikely that quantum computing will completely kill cryptography as we know it.

Cryptography, at its core, is the practice of secure communication. It involves the use of mathematical algorithms to encode and decode messages in such a way that only the intended recipients can read them. These algorithms rely on the fact that certain mathematical problems are computationally difficult to solve, even with modern computers.

Quantum computers, on the other hand, are a new type of computer that uses quantum mechanical phenomena, such as superposition and entanglement, to perform calculations. They have the potential to solve certain problems much faster than classical computers, which could potentially make certain cryptographic algorithms vulnerable to attacks.

One such algorithm is the RSA algorithm, which is widely used for secure communication and is based on the difficulty of factoring large numbers. Quantum computers could potentially factorize these numbers much faster than classical computers, making RSA vulnerable to attacks.

However, it is important to note that quantum computers are still in the early stages of development and are not yet widely available. In addition, there are many other cryptographic algorithms that are not vulnerable to attacks by quantum computers, such as symmetric key algorithms like AES and hash functions like SHA-256.

Furthermore, the development of quantum-resistant cryptographic algorithms is an active area of research, and it is likely that new cryptographic methods will be developed to withstand attacks from quantum computers.

In summary, while quantum computers may pose a threat to certain cryptographic algorithms, it is unlikely that they will completely kill cryptography as we know it. The field of cryptography is constantly evolving and will likely continue to adapt and develop new methods to ensure secure communication in the face of new technological advances.